’62 merc 700 FGS issues

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  • December 6, 2016 at 12:25 am #5839
    tinker-bell
    Participant

      Hi all – hoping someone can comment on an issue I am having with my ’62 mere 700 FGS.

      When accelerating as I am pushing throttle forward, she gets up to speed for 10 seconds or so, then speed backs way down, without me touching the throttle…. back in nuetral, she allows me to get up to speed again, and then the same thing -the ghost backs down to 10 MPH or so….Could it be coils/condensors? (I didn’t replace those) something in the distributor?? could it be as simple as old cables from the throttle stiff and inflexible?? I have rebuilt all three carbs, both fuel pumps, all new spark plugs and fuel lines. Good compression on all 6. Otherwise, she starts right up and sounds good… any comments are much appreciated-

      December 6, 2016 at 12:59 am #48619
      dave-bernard
      Participant

        US Member

        when it does that tap on the choke . may be lean.

        December 6, 2016 at 1:59 am #48623
        tinker-bell
        Participant

          right – and then a carb adjustment to follow perhaps? or just momentary thing??

          December 6, 2016 at 2:21 am #48625
          tinker-bell
          Participant

            Saw this on another post.. do you agree??
            "Usually when people talk about motors running lean, they are referring to the fuel/air ratio. Signs that the fuel/air ratio is too lean are things like; backfires at high throttle settings, hesitation when the throttle is opened, or the motor actually slowing down the more you open the throttle. "
            If this is the case then perhaps I just need to open up the screws on each carb a bit more – would that correct it??

            December 6, 2016 at 3:00 am #48627
            tinker-bell
            Participant

              Well, after reviewing the master service manual carb adjustment and sync section(several times) it seems each carb must be adjusted while engine is under load.. hard to do that from my couch, but I’ll give it a shot on the lake sometime soon….

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